|  | 4.4 | Explain Layer 2 Design
| 4.4.7 | Migrating a network from 10 Mbps to 100 Mbps
As the network grows, the need for more bandwidth increases. In the vertical cabling between MDF and IDFs, unused fiber optics can be connected from the VCC to 100 Mbps ports on the switch. The network shown doubles the capacity of the vertical cabling in the network in the following graphic by bringing up another link. In the horizontal cabling, you can increase the bandwidth by a factor of 10 by repatching from the HCC to a 100 Mbps port on the switch and changing from a 10 Mbps hub to a 100 Mbps hub. When sizing the Layer 2 LAN switch, it is important to make sure there are enough 100 Mbps ports to allow for this migration to higher bandwidth. It is important to document the speed at which each active cable drop is running.